import React, { useRef } from 'react'
import store from '../../store'
import { actions } from '../../store/reducers/count'

function Count() {
  const selectNumberRef = useRef()

  // 加
  const onIncrement = () => {
    const { value } = selectNumberRef.current
    store.dispatch(actions.increment(+value))
  }

  // 减
  const onDecrement = () => {
    const { value } = selectNumberRef.current
    store.dispatch(actions.decrement(+value))
  }

  // 如果为奇数，则加
  const onIncrementIfOdd = () => {
    const { value } = selectNumberRef.current
    const count = store.getState()
    if (count % 2 !== 0) {
      store.dispatch(actions.increment(+value))
    }
  }

  // 异步延迟加
  const onIncrementIfAsync = () => {
    const { value } = selectNumberRef.current
   store.dispatch(actions.incrementAsync(+value, 500))
  }

  return (
    <div style={{ width: 500, margin: '0 auto' }}>
      <h1>当前求和为：{store.getState()}</h1>
      <select ref={selectNumberRef}>
        <option value='1'>1</option>
        <option value='2'>2</option>
        <option value='3'>3</option>
      </select>
      <button onClick={onIncrement}>+</button>
      <button onClick={onDecrement}>-</button>
      <button onClick={onIncrementIfOdd}>当前求和为奇数再加</button>
      <button onClick={onIncrementIfAsync}>异步加</button>
    </div>
  )
}

export default Count
